package CelestialWeb;

import CelestialDataAccess.Product;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import CelestialDataAccess.*;
import CelestialDataStructures.*;

public class ProductsServlet extends HttpServlet {

    private WriteXMLError m_WriteError = new WriteXMLError();
    /** 
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {

        String strProductID = request.getParameter("prod_id");

        response.setContentType("text/xml");
        response.setHeader("Cache-control", "no-cache");
        PrintWriter pw = response.getWriter();

        if(strProductID==null){
            m_WriteError.writeSingleError(1, "No Product ID is supplied", pw);
            return;
        }

        ProductsDataAccess daProducts = new ProductsDataAccess();
        Product prod;
        try{
            prod = daProducts.getProductByID(strProductID);
        }catch(DataAccessException ex){
            m_WriteError.writeSingleError(16384, ex.getMessage(), pw);
            return;
        }
        if(prod==null){
            m_WriteError.writeSingleError(2, "No product records found for " + strProductID, pw);
            return;
        }
        /* no errors, write XML data now */
        pw.write("<Product>");
        pw.write("<ProductID>" + prod.getProductID() + "</ProductID>");
        pw.write("<ProductName>" + prod.getProductName() + "</ProductName>");
        pw.write("<Description>" + prod.getDescription() + "</Description>");
        pw.write("<Price>" + PriceFormat.format((prod.getPrice())) + "</Price>");
        pw.write("<Units>" + Integer.toString(prod.getUnits()) + "</Units>");
        pw.write("</Product>");
        pw.close();
    } 

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /** 
     * Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    } 

    /** 
     * Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
     * Returns a short description of the servlet.
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

}
